Dynamo-electric machine.



No. 669,574. Patented Mar. l2, 19m. 0. M. Buss.

DYNMIO ELECTRIC MACHINE.

(Application filed Feb. 19, 1900) (No Model.) 2 Shoots-Shoot l.

aid 916,388,863 Ewen/ 4071 No. 669,574. Patented Mar. I2, I90! D. M. BLISS.

DYNAMO ELECTRIC MACHINE.

(Application filed Feb. 19. 1900) (N0 Modal.)

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DONALD M. BLISS, OF LOWELL, MASSACHUSETTS, ASSIGNOR TO THE NETV ENGLAND MOTOR COMPANY, OF MASSACHUSETTS.

DYNAMQ-ELECTRIG MACll-HNE.

SPEGITEIGATION forming; part of Letters Patent No. 669,574, dated March 12, 1901.

Application filed February 19, 1900. serial No, 5,796. (No model.)

To all whom it may concern:

Beit known that I, DONALD M. BLISS, asubject of the Queen of Great Britain, residing in Lowell, county of Middlesex, and State of Massachusetts, have invented an Improvement in Dynamo-Electric Machines, of which the following description, in connection with the accompanying drawings,is a specification, like letters on the drawings representing like parts.

The present invention relates to dynamoelectric machinery, and is embodied in a dynamo or motor of novel construction and arrangement, the objects of the invention being to facilitate the assembling of the machine and the proper alining of the armature and to readily secure the proper adjustment of the armature with relation to the field-magnets without special designing or fitting in different machines of the same type and size, and also to render the parts interchangeable. In machines of this class as now commonly constructed the armature-bearings are usually individually attached toor all formed integral with the base of the machine or the fieldinagnet frame, and it is difficult to get the said bearings in proper alinement with each other in every case and also to obtain the proper endWise adjustment of the armature in said bearings owing to the fact that different armatures will seek slightly different positions in the magnetic field owing to slight variations in the density of the core, 650., which variations it is practically impossible to 0bviate. The consequence is thatbearings which are separately attached to the field-frame or base of the motor, even if they can be arranged in perfect alinement with each other, may have to be adjusted endwise after the armature is set up, while if the said bearings are formed integral with the field-frame .or base the thrust portion of one hearing may have to be cut away and the corresponding portion of the other bearing built up in order to properly support the armature without undue end-thrust friction. To obviate these difficulties, the armature, in accordance with the present invention, is mounted in a frame or cradle separate from the field-magnet frame,

but supported thereby, the said cradle being :0 shown as having supporting lugs or projections the external surface of which conforms to the internal corresponding surface of the said field-magnet frame, the said armature frame or cradle being conveniently formed in a single piece, with the bearings bored in true alinement with each other, it being obvious that the armature will thus be properly centered with relation to the frame when the cradle-lugs are fitted to the inner surface thereof, while the said cradle may be longitudinally adjusted as a whole with relation to the frame in accordance with the position which the armature will naturally assume under the influence of the magnetic field.

A further feature of the invention consists in providing the machine with a brush-holding ring having a supporting portion also shaped to fit the field-magnet frame, the said brush-holding ring being also capable of adjustment with relation to the field-magnet frame, so that it can be brought to the proper position with relation to the commutator.

A further advantage of the construction embodying the invention is that in cases where the base or supporting plate for the motor forms a part of the field-magnet frame the armature-cradle and field -magnet frame may be symmetrical in shape, whereby the cradle may be inserted in such a position as to properly support the armature regardless of the position of the motor in case the supporting-base is supported from the wall or the ceiling.

The fastening devices for the field-magnet poles and the armature frame or cradle may be interchangeable, so that if the base of the motor-frame is supported vertically the fieldmagnet cores may be secured at the points where the armature-cradle would be secured if the frame were supported horizontally, and vice versa.

The invention is herein shown as embodied in a bipolar machine, it being obvious, however, that by properly shaping the armature 5 cradle or frame it may be equally well adapted to a multipola-r machine, and the supportingsurfaces of the field-magnet frame and cradle are shown as cylindrical and turned to the same diameter, this being the simplest way of securing good symmetry and a perfect fit.

Figure 1 is an end elevation, partly in section, of a dynamo-electric machine embodying the invention; and Fig. 2 is a longitudinal horizontal section of the same, the armature and a portion of its cradle being shown in elevation.

In accordance with the invention the armature A is initially supported in a cradle or frame Ct, having bearings (62 formed as a part of said frame, so that they can be made in perfect alinement with each other, the said frame being detachably secured to the motor or field-magnet frame I). The said field-magnet frame is shown as having a cylindrical inner su portingsurfaee Z1 and the armature cradle or frame is provided with an on ter sur face to conform to said surface 12 said outer surface being shown as formed on lugs or projecting portions a so that the said frame can be inserted in the motor-frame without interfering with the field-magnet cores h The said armature cradle or frame a is longitudinally adjustable with relation to the fieldmagnet frame Z), those portions of the said cradle which are parallel to the said frame being shown as provided with slots 0,, Fig. 2, adapted to receive fastening-screws a shown as projecting through a suitable opening in the motor-frame Z), the parts being fastened together by means of nuts a shown as provided with washers a to afford a proper hearing along the slots a. By this construction it is obvious that the bearings of the motor will always be in perfect alinement with each other, while if it is found after the parts are assembled that the armature in seeking its natural position in the magnetic field bears unduly against one end or the other of the frame the said frame as a whole can be adj usted with relation to the motor-frame until the said armature is in the proper position to run freely without end-thrust friction. Furthermore, with this construction the polepieces b may be removably secured to the frame, as by means of bolts b, the said frame being provided with openings for said bolts, and when, as herein shown, the said frame is provided with a base-piece If it is obvious that, since the armature-cradle and the polepieces are readily interchangeable in position, the motor can be properly set up if it is desirable to secure the said base-piece to a vertical instead of a horizontal support. To pro vide for such interchangeability, it is essential only that the frame should be symmetrical-as, for example, rectangular and equilateral.

The armature-cradle a is herein shown as an open frame or spider having concave bearing portions at its ends, as indicated in Fig. 1, the bearings a being completed by separable bearing members, which may be secured thereon by cap-screws, as shown. The supporting-surfaces of the said cradle or lugs ct at the sides thereof are shown as widened, so as to provide comparatively large engaging portions to fit the field-magnet frame I) withoutinterferingwithlhcpole-pieees or unduly adding to the weight of the cradle.

The brushes 0 are shown as seen red to lugs or projections c from a brush-supportingde vice or ring 0, which is also independently constructed and arranged to [it the motor frame or casi ngsubstantially as the said fram c or casing is titted by the arinat-ure-supporting cradle a. As herein shown, the said ring is provided with an annular flange 0, the external diameter of which is the same as the internal diameter of the motor-frame,the said ring being shown as secured to said frame by means of bolts or cap-screws 0 As best shown in Fig. 1, the said ringis provided with recesses c at its pointsofronnection with the motor-frame, so that the brushes can be ad jnsted with relation to the commutator by turning the ring with relation to said frame before the eap-screws c are set up to fasten the same in position. It is obvious, moreover, that the said brush-holding ring can be secured in any position desired by merely providing openings for the cap-screws in the motorframe at such points as may be necessary along the periphery thereof.

It will be seen from the foregoing description that the motor embodying the invention is readily assembled and can be adjusted to run perfectly without any material changein the several parts thereof, while all of the said parts are interchangeable and capable of being properly positioned with relation to each other regardless of the position in which the motor is to be supported or installed.

I do not claim, broadly, the combination of a field-magnet frame with an independent armature-cradle adapted to be seen red thereto, since I am aware of United States Patent No. 631,518, granted August 22,1899, to James Burke; but

What 1 do claim is 1. The combination with the field-magnet frame having asymmetrical inner surface; of an arimtture-cradle containing bearings for the armature and adapted to be supported upon the inner surface of said frame, the said cradle having a symmetrical surface to cor respond with and engage that of the frame, as set forth.

2. The combination with the field-magnet frame havinginwardly-projecting pole-pieces; of an armature-cradle provided with a supporting portion fitting the inner surface of said field-magnet frame, whereby the said cradle and armature may be inserted or removed endwise without disturbing the fieldmagnet frame or pole-pieces.

3. The combination with the field-magnet frame; of an armature-cradle independent of said frame and containing bearings for the armature; and means for longitudinally adjusting said armature'cradle with relation to said field-magnet frame to obtain the proper IIO enameposition of the armature in the m agnetie field, as set forth.

4:- In a dynamo-electric machine, the combination with a frame adapted to support the pole-pieces; of an armature-cradle adapted to be seen red thereto; and a brush-holder also adapted to be seen red thereto, as set forth.

5. In a dynamo-electric machine, the combination with the field-magnet frame provided With an inner cylindrical surface; of an armature-cradle having external cylindrical supporting-surface portions of a diameter substantially equal to that of the inner surface of the frame, as set forth.

6. The combination With the field-magnet frame; of an independent frame containing bearings for the armature and supported by said field-magnet frame; and means for longitudinally adjusting the position of said independent frame With relation to the fieldmagnet frame, as set forth.

7. The combination with a frame provided with an internal cylindrical bearing-surface; of pole-pieces adapted to be secured to said bearing-surface; an armature frame or cradle containing bearings for the said armature and supporting portions, the outer surfaces of which are curved to conform to the diameter of the inner surface of the frame; fastening devices for said pole-pieces and said armature-frame which are interchangeable; and a brush-holding ring having a supporting-flange adapted to tit the inner surface of the motor-frame, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DONALD M. BLISS.

Witnesses:

HENRY J. LIVERMORE, NANCY P. FORD. 

